Aeroplane propeller



July 22; 1930. WOLL 1,771,365

AEROPLANE PROPELLER Filed Sept. 29, 1927 Patented July 22, 1930 UNITEDSTATES JOSEPH WOLL, OF WOODVILLE, PENNSYLVANIA AEROPLANE PRQI'ELLERApplication filed September 29, 1927. Serial No. 222,810.

I This invention relates to a propeller primarily adapted for aeroplaneuse.

It is'aimed to pi'ovide an exceedingly simple construction, which isefllcient and dur- 5 able and wherein the blades may be readily removedand replaced.

Another object is to provide a particular 7 construction wherein thepropeller substan tially forms a triangle with the blades extending atleast one-half the length of a side of the triangle so as to givemaximum wind pressure and have two ways of forcing or impinging againstthe wind.

7 The more specific objects and advantages will become apparent from aconsideration of thedescription following taken in connection withaccompanying drawings illustrating an operative embodiment.

In said drawings Figure 1 is a view of:the propeller in front elevation;

Figure 2 is an edge view thereof, with parts partly broken away a-nd insection to disclose details; 1 Figure 3 is an elevation similar toFigure 1 but with the fastening elements partly removed and in section;

Figure 4 is a sectional view taken on the line IT-4 of Figure 1, and

Figure 5 is an edge view of one of the blades. p

Referring specifically to the drawings, the propeller is made up ofthreeor more blade elements 10 each comprising attaching plate portions 11and blades proper 12, integral therewith. It will be noted that theblades 12 are disposed at an angle of 45 with respect tothe plates 11and are approximately twice as long as the plates.

In assembling the blade members, they are arranged with the plates 11 inthe same plane as shown particularly in Figure 3 so as to form triangleand the blades 12 extend at 7 least half way along the sides of saidtriangle'. The meeting edges of the plates 11 are in diverging relationas shown particularly in Figure 3. On oppositesides of the plates 11,triangular securing plates 13 are provided and'they are secured togetherand to the plates 11 by means of removable bolts 14.

Extending through the securing plates 13 and at the center of thetriangle formed by plates 11, is a shaft 15, such shaft having ashoulder at 16 against which a hub 17 on one of the securng plates 13abuts. A hub 18 is provided on the other securing plate and a detachablekey 19 extends through a slot 20 therein and through the hub 18, wherebythe propeller is connected to the shaft against 6 relative turningmovement. Nuts 21 are threaded on the shaft 15beyond the hub 18 and oneserves as a lock for the other. V

The portions of the plates 11 engaging the shaft 15 are arcuate as at 22in order to fit the same. While the triangular formation illustrate ispreferred, it is to be understood that I do not limit myself to the useof three of the members 10 since any desired number maybe provided withthe plates 13 shaped accordingly.

Various changes may be resorted to provided they fall within the spiritand scope of the invention. 7

I claim as my invention 1. A propeller having one-piece blade members,each blade member consisting of an attaching plate and ablade longerthan the same disposed at an angle to the plane thereof and atone'sideedge thereof, and

means securing the attaching plates in edge. contact and insubstantially the sameplane.

edge contact and in substantially the same 1 plane, said edges havingarcuate portions to accommodate a shaft.

3. A propeller comprising one-piece blade members, said memberscomprising attaching plates and blades straight throughout and longerthan said plates and disposed at an angle thereto, said blades beingarran ed tangentially with respect to a circle descri ed from the centerof the propeller, said plates extending laterally from said blades and"having diverging edges, said edges being arranged in contact, securingplates disposed against the first mentioned plates, fastening 7 elementsdetachably connecting the first mentioned plates and securing plates.

In testimony whereof I aflix my signature.

SErH WO

